Phonograph record



Patented June 23, 1942 2,287,240 PHONOGRAPH RECORD Guy E. Haltenhof, Columbia, Ill., assigner of ten per cent to Fridolin Bersche, Waterloo, lll., and

thirtye per cent to Leo A. Weilbacher,

Columbia, Ill.

Application May 14,1941, serial No. 393,435

3 Claims. (Cl

The present invention relates to new and useful improvements in phonograph records of the disk type and has for its primary object to provide a secondary record or disk secured in position at the center of the main record and having guide grooves providing communication between the recording grooves of the main and secondary disks to guide the needle from the main to the secondary record.

A further object is to provide a simple and inexpensive method of adding a trailer record to a conventional phonograph disk record for use as an advertising medium.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming parts hereof, wherein like numerals refer to like parts and in which- Figure 1 is a top plan view and Figures 2 and 3 are sectional views taken respectively on the lines 2-2 and 3-3 of Figure l.

Referring now to the drawing in detail, the numeral 5 designates a conventional type of disk phonograph record having the spiral recording grooves 6 in the surface thereof. An auxiliary or secondary disk or record 1 is adhesively or otherwise suitably secured to the upper surface of the disk 5 at its center, the disk 1 also having recording grooves 8 on its upper surface and communieating with the grooves 6 of the main disk by a spiral guide groove 9.

In order that the phonograph needle may rise over the edge of the auxiliary disk, I provide said A auxiliary disk with a radially projecting shoulder Il) having a circumferentially tapering edge Il along which the guide groove 9 extends. The sound grooves of the auxiliary disk 1 terminate in the usual eccentric stopping groove I2 at the end of the recording which provides means for operating the conventional mechanical pick-up and record changing device.

After the regular record has been played from the sound grooves on the main disk 5, the needle is then guided onto the auxiliary disk 1 whereupon the playing of this latter record continues.

The auxiliary record 1 may be used for adding an advertisement or announcement at the end of the regular record.

'I'he adhesive attaching means for the auxiliary record is suicient only to prevent slipping of the said record on the main record and will permit removal and replacement of the auxiliary record, when desired.

It is believed the details of construction and manner of use of the device will be readily understood from the foregoing without further detailed explanation.

What is claimed as new is:

1. A phonograph record of the disk type having spirally arranged sound grooves in'its surface, a second record disk secured to the upper surface of the first disk and also having sound grooves in its upper surface, said second record having a spirally formed peripheral edge portion defining a radial projection having a circumferentially extending tapering surface, and a guide groove leading from the sound grooves of the first disk to the sound grooves of the second disk across said tapering surface.

2. A phonograph record of the disk type having spirally arranged sound grooves in its surface, a second record disk secured to the upper surface of the rst disk and also having sound grooves in its upper surface, a circumferentially extending tapering edge on said second disk and a guide groove leading from the sound grooves of the rst disk to the sound grooves of the second disk and traversing said tapering edge.

3. A phonograph record of the disk type having spirally arranged sound grooves in its surface, a second record disk secured to the upper surface of the first disk and also having sound grooves in its upper surface, a shoulder on'the peripherial edge of said second disk and extending radially thereof, said shoulder having a circumferentially extending tapering surface and a guide groove leading from the sound grooves of the first disk to the sound grooves of the second disk and traversing said tapering surface.

GUY E. HALTENHOF. 

